/**
* Copyright 2013-2016 Guoqiang Chen, Shanghai, China. All rights reserved.
*
* Author: Guoqiang Chen
* Email: subchen@gmail.com
* WebURL: https://github.com/subchen
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jetbrick.util;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
public final class DateUtils {
public static final long SECOND_IN_MILLIS = 1000;
public static final long MINITE_IN_MILLIS = SECOND_IN_MILLIS * 60;
public static final long HOUR_IN_MILLIS = MINITE_IN_MILLIS * 60;
public static final long DAY_IN_MILLIS = HOUR_IN_MILLIS * 24;
public static final long WEEK_IN_MILLIS = DAY_IN_MILLIS * 7;
public static final String STD_DATE_PATTERN = "yyyy-MM-dd";
public static final String STD_TIME_PATTERN = "HH:mm:ss";
public static final String STD_DATETIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
public static final String RFC822_DATETIME_PATTERN = "EEE, dd MMM yyyy HH:mm:ss 'GMT'";
public static final String W3C_DATETIME_PATTERN = "yyyy-MM-dd'T'HH:mm:ss'Z'";
//@formatter:off
private static final String[] RFC822_PATTENRS = {
"EEE, dd MMM yy HH:mm:ss z",
"EEE, dd MMM yy HH:mm z",
"dd MMM yy HH:mm:ss z",
"dd MMM yy HH:mm z",
};
private static final String[] W3CDATETIME_PATTERNS = {
"yyyy-MM-dd'T'HH:mm:ss.SSSz",
"yyyy-MM-dd't'HH:mm:ss.SSSz",
"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
"yyyy-MM-dd't'HH:mm:ss.SSS'z'",
"yyyy-MM-dd'T'HH:mm:ssz",
"yyyy-MM-dd't'HH:mm:ssz",
"yyyy-MM-dd'T'HH:mm:ss'Z'",
"yyyy-MM-dd't'HH:mm:ss'z'",
"yyyy-MM-dd'T'HH:mmz",
"yyyy-MM'T'HH:mmz",
"yyyy'T'HH:mmz",
"yyyy-MM-dd't'HH:mmz",
"yyyy-MM-dd'T'HH:mm'Z'",
"yyyy-MM-dd't'HH:mm'z'",
"yyyy-MM-dd",
"yyyy-MM",
"yyyy",
};
private static final String[] STD_PATTERNS = {
"yyyy-MM-dd HH:mm:ss,SSS",
"yyyy-MM-dd HH:mm:ss.SSS",
"yyyy-MM-dd HH:mm:ss",
"yyyy-MM-dd HH:mm",
"yyyy-MM-dd",
"yyyy/MM/dd HH:mm:ss,SSS",
"yyyy/MM/dd HH:mm:ss.SSS",
"yyyy/MM/dd HH:mm:ss",
"yyyy/MM/dd HH:mm",
"yyyy/MM/dd",
"yyyyMMddHHmmss",
"yyyyMMdd",
"hh:mm:ss,SSS",
"hh:mm:ss.SSS",
"hh:mm:ss",
};
//@formatter:on
/**
* 用指定的格式格式化当前时间.
*/
public static String format(String pattern) {
return format(new Date(), pattern);
}
/**
* 用指定的格式格式化指定时间.
*/
public static String format(Date date, String pattern) {
SimpleDateFormat df = new SimpleDateFormat(pattern);
return df.format(date);
}
/**
* 用尝试多种格式解析日期时间.
*
* @param date 时间字符串
* @return 如果无法解析，那么返回 {@code null}
*/
public static Date parse(String date) {
Date d = parse(date, STD_PATTERNS);
if (d == null) {
d = parseRFC822Date(date);
}
if (d == null) {
d = parseW3CDateTime(date);
}
if (d == null) {
try {
d = DateFormat.getInstance().parse(date);
} catch (ParseException e) {
d = null;
}
}
return d;
}
/**
* 用指定的格式解析日期时间.
*
* @param date 时间字符串
* @param pattern see {@link java.text.SimpleDateFormat}
* @return 如果无法解析，那么返回 {@code null}
*/
public static Date parse(String date, String pattern) {
SimpleDateFormat df = new SimpleDateFormat(pattern);
df.setLenient(false);
try {
ParsePosition pp = new ParsePosition(0);
Date d = df.parse(date, pp);
if (d != null && pp.getIndex() == date.length()) {
return d;
}
} catch (Exception e) {
}
return null;
}
/**
* 用指定的格式解析日期时间.
*
* @param date 时间字符串
* @param patterns 多个模式，see {@link java.text.SimpleDateFormat}
* @return 如果无法解析，那么返回 {@code null}
*/
public static Date parse(String date, String[] patterns) {
if (date == null || date.length() == 0) {
return null;
}
date = date.trim();
for (String pattern : patterns) {
SimpleDateFormat df = new SimpleDateFormat(pattern);
df.setLenient(false);
try {
ParsePosition pp = new ParsePosition(0);
Date d = df.parse(date, pp);
if (d != null && pp.getIndex() == date.length()) {
return d;
}
} catch (Exception e) {
}
}
return null;
}
public static Date parseRFC822Date(String date) {
int ipos = date.indexOf(" UT");
if (ipos > -1) {
String pre = date.substring(0, ipos);
String post = date.substring(ipos + 3);
date = pre + " GMT" + post;
}
return parse(date, RFC822_PATTENRS);
}
public static Date parseW3CDateTime(String date) {
// if sDate has time on it, it injects 'GTM' before de TZ displacement
// to allow the SimpleDateFormat parser to parse it properly
int tIndex = date.indexOf("T");
if (tIndex > -1) {
if (date.endsWith("Z")) {
date = date.substring(0, date.length() - 1) + "+00:00";
}
int tzdIndex = date.indexOf("+", tIndex);
if (tzdIndex == -1) {
tzdIndex = date.indexOf("-", tIndex);
}
if (tzdIndex > -1) {
String pre = date.substring(0, tzdIndex);
int secFraction = pre.indexOf(",");
if (secFraction > -1) {
pre = pre.substring(0, secFraction);
}
String post = date.substring(tzdIndex);
date = pre + "GMT" + post;
}
} else {
date += "T00:00GMT";
}
return parse(date, W3CDATETIME_PATTERNS);
}
public static String formatRFC822(Date date) {
SimpleDateFormat df = new SimpleDateFormat(RFC822_DATETIME_PATTERN);
df.setTimeZone(TimeZone.getTimeZone("GMT"));
return df.format(date);
}
public static String formatW3CDateTime(Date date) {
SimpleDateFormat df = new SimpleDateFormat(W3C_DATETIME_PATTERN);
df.setTimeZone(TimeZone.getTimeZone("GMT"));
return df.format(date);
}
}